[RFA] new test for separate debug info

[Michael Elizabeth Chastain]

eza> woah. I didn't test this. And I guess nobody did until now.
eza> RH ships only dwarf2 toolchains.

As an aside, my red hat 8.0 gcc supports both dwarf-2 and stabs+,
with dwarf-2 as default.  FSF gcc for i686-pc-linux-gnu has also
been this way since 3.1 or 3.2.

If I recall correctly, FSF gcc for sparc-sun-solaris is still
stabs+ by default, but I wouldn't swear to it.

I'm still waiting for dwarf-1 to die before I take up a
stabs+ death watch!

Michael C